Their knowing hardly requires details about yourself, or even what transpired. Vague detail can inspire prudence, or at the least wariness.
[What can he say? He knows how to feed people with just enough that they'll do what he wants them to do. Not that this is a case of that, but the spy does know what he's doing.
[action]
[What can he say? He knows how to feed people with just enough that they'll do what he wants them to do. Not that this is a case of that, but the spy does know what he's doing.
He also wants to know who this madman is.]